package ooday01;
//构造方法演示
public class ConDemo {
    public static void main(String[] args) {
        Student zs = new Student();
        Student ls = new Student("李四",25);
        Student ww = new Student("王五",22,"jsd2302","001");
        zs.sayhi();
        ls.sayhi();
        ww.sayhi();
    }
}
